... 1.double clamp is easy to fix your files 2.file folder,office supply 3.made of 3 layer foamed pp ... collecting documents.4.it is an ideal office stationery supply,a convenient clipboard. 5.the thickness is 0.7mm6.suitable for A4 ... file,clear book,pencil case,gift box,notebook,report file,file pocket,card case,ring binder,index divider,clipboard,cd case A4 pp double file ...